Water flowing at a rate of 10 kg/s through 50 double-pass tubes in a shell-and-tube heat exchanger heats air that flows through the shell side. The length of the brass tubes is 6.7 cm, and they have...

Water flowing at a rate of 10 kg/s through 50 double-pass tubes in a shell-and-tube heat exchanger heats air that flows through the shell side. The length of the brass tubes is 6.7 cm, and they have an outer diameter of 26 mm and an inner diameter of 23 mm. The heat transfer coefficients of the water and air are 470 W/m²
K and 210 W/m²
K, respectively. Air enters the shell at a temperature of 15C and a flow rate of 1.6 kg/s. The temperature of the water as it enters the tubes is 75C. Calculate (a) the heat exchanger effectiveness, (b) the heat transfer rate to the air and (c) the outlet temperatures of the air and water.